Global Patent Index - EP 0680226 B1

EP 0680226 B1 2000-01-26 - Kinescope driver apparatus with gamma correction

Title (en)

Kinescope driver apparatus with gamma correction

Title (de)

Treiberstufe für eine Bildröhre mit einer Gammakorrektur

Title (fr)

Etage d'attaque pour un tube cathodique avec correction de gamma

Publication

EP 0680226 B1 (EN)

Application

EP 95105816 A

Priority

US 23402694 A

Abstract (en)

[origin: EP0680226A2] An amplifier (60) provides an amplified video signal in response to a video input signal supplied thereto. A cathode current sensor (Q3), couples an output of the amplifier to the cathode of a kinescope (20) and also provides an output current (Ik) proportional to the kinescope cathode current. A feedback path (82) applies a portion of the sensed cathode current provided by the cathode current sensor to a circuit node (65 or 63) in the amplifier for imparting gamma correction to images produced by the kinescope. In one application the cathode current is apportioned (Q3) to provide gamma correction for the kinescope and to provide automatic kinescope bias (AKB) control. <IMAGE>

IPC 1-7 (main, further and additional classification)

H04N 9/69

IPC 8 full level (invention and additional information)

H04N 5/202 (2006.01); H04N 5/66 (2006.01); H04N 5/68 (2006.01); H04N 9/64 (2006.01); H04N 9/69 (2006.01)

CPC (invention and additional information)

H04N 9/645 (2013.01); H04N 9/69 (2013.01)

Designated contracting state (EPC)

DE ES FR GB IT PT

EPO simple patent family

EP 0680226 A2 19951102; EP 0680226 A3 19970115; EP 0680226 B1 20000126; CA 2145901 A1 19951029; CA 2145901 C 20000222; CN 1106119 C 20030416; CN 1111880 A 19951115; DE 69514707 D1 20000302; DE 69514707 T2 20000621; ES 2141274 T3 20000316; JP 3749554 B2 20060301; JP H0851558 A 19960220; PL 176104 B1 19990430; PL 308325 A1 19951030; PT 680226 E 20000630; RU 2183386 C2 20020610; RU 95106508 A 19970127; TR 28775 A 19970306; US 5835161 A 19981110

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